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Smallest Four Gas Confined Space Monitor

GX-2009 confined space monitorRKI is proud to offer the smallest and lightest 4-gas monitor in the world, the GX-2009. Weighing only 4.6 ounces, it fits in the palm of your hand (2.75” H x 2.95” L x .98” D). The GX-2009 simultaneously monitors and displays combustibles, oxygen, carbon monoxide, and hydrogen sulfide. The GX-2009 represents the latest evolution of gas detection technology. Advancements include dual audible alarm ports and alarm LED’s on 3 sides of the instrument, so that alarm conditions are obvious from multiple perspectives especially in high noise environments. Other features include a water-resistant and dustproof design with IP 67 rating, an impact resistant rubber over-mold body that is RFI resistant, and a large capacity data logging system included as standard.

  • Features
  • Specifications
  • Downloads
  • Parts
  • Video


  • Simultaneous detection of 4 gases, LEL, O2, H2S & CO
  • Smallest / Lightest 4 gas monitor on the market ° 2.7” H x 3” W x 1” D, 4.6 oz
  • Dual audible alarm ports (95 db @ 30 cm)
  • 3 visual alarm LED’s
  • Vibration alarm
  • IP-67 water-resistant/dustproof design
  • Calibration and bump test lock out or reminder controls
  • Large capacity data logging standard
    - 8 alarm trends
    - Log time range of 10 to 300 hrs
    - 100 calibration records
  • 20 hours of operation (NiMH batteries)
  • Large LCD display screen
  • Automatic backlighting at alarm
  • Impact resistant over-mold body, RFI shielded body
  • STEL and TWA readouts
  • Intrinsically safe, CSA, C/US classified, IECEx / ATEX approved
  • 2 year warranty


  • Personal monitoring
  • Confined spaces
  • Refineries/petrochemical
  • Utilities
  • Hazardous material
  • Water/wastewater
  • Fire services
  • Construction
GX-2009 manhole

Other standard features are vibration alarm, auto-calibration, calibration and bump test lock out or reminder control, STEL / TWA readings, peak hold, auto backlighting at alarm on a large LCD display, and it even tells the time! All of these controls and features are operated through 2 simple glow-in-the dark, glove friendly buttons. The NiMH battery set will operate for 20 hours and will fully charge in 3 hours.

A huge capacity data logging function is a standard feature on all GX-2009 instruments. The data logging software will store up to 100 calibration records and is Windows 7, XP, and Vista compatible. The GX-2009 is also functional with the Data Cal 2000 instrument maintenance system and the SM-2009U single calibration station.

The GX-2009 is designed around RKI’s compact and proven sensors, utilizing catalytic combustion, electrochemical and galvanic sensor technologies. Each miniaturized sensor is manufactured with the same high quality control that has made RKI sensors and instruments the most reliable and long lasting monitoring devices in the industry.
The GX-2009 is designed around RKI's compact and proven sensors, utilizing catalytic combustion, electrochemical and galvanic sensor technologies. Each miniaturized sensor is manufactured with the same high quality control that has made RKI sensors and instruments the most reliable and long lasting monitoring devices in the industry.
Gas Detected
All Combustible Gases (Methane as standard)
Oxygen (O2)
Hydrogen Sulfide
Carbon Monoxide
Detection Principle Catalytic combustion Galvanic cell Electrochemical cell
Detection Range 0~100% LEL 0~40.0% Vol.
(0.1% Vol.)
0~100 ppm (0.5 ppm) 0~500 ppm (1 ppm)
Accuracy Statement
(whichever is greater)
± 5% of reading or ± 2% LEL ± 0.5% O2 ± 5% of reading or ± 2 ppm H2S ± 5% of reading or ± 5 ppm CO
Sampling Method Diffusion sampling standard / hand aspirator or motorized pump optional
Display Digital LCD displays all four gases simultaneously, with auto backlight
Alarm Method
Gas alarms: 1st and 2nd (user adjustable), STEL, TWA and OVER
Trouble alarms: Sensor connection, low battery, low flow, circuit trouble and calibration error
Types of Alarms
Gas Alarm: 2 increasing alarms, STEL, TWA, overscale alarm
Trouble alarm: Sensor disconnection, wire disconnection, low battery, circuit error, calibration range error
Operating Temp. & Humidity -4°F to 122°F (-20°C ~ +50°C), 0 to 95% RH, non-condensing (splash resistant)
Response Time Within 30 seconds (T90)
Continuous Operation 20 hours after a 3 hour full charge (14 hours after 90 min charge)
Power Source Direct charging NiMH batteries, set of 2
Safety Design IECEx zone 0 Ex ia IIC T4; ATEX II 1G Ex ia IIC T4;
CSA classified, “C/US”, as intrinsically safe. Class I, Division 1, Groups A, B, C, D
Dimensions & Weight 2.7” H x 3” W x 1” D (Approx. 70 H x 75 W x 25 D mm), 4.6 ounces (approx. 130g)
Case Material RFI shielded high impact over molded rubber. Dust and water-resistant with IP-67 approval.
Controls Two glow in the dark buttons: POWER / MODE, AIR
Required Accessories Battery charger
Standard Accessories
Battery charger, Alligator clip, NiMH batteries (set of 2)
Optional Accessories
  • Belt Clip
  • Padded carrying case for GX-2009 and accessories
  • Charging station, 115/220 VAC powered for 2, 3, 4, or 5 instruments
  • Charging station with 12 VDC power supply and vehicle adapter plug
  • 12 VDC adapter with vehicle plug (does not include charger base)
  • RP-6 sample drawing pump with 10’ hose and probe
  • Hand aspirated sample draw with 10’ hose and probe
Configurations 4 gas (LEL / O2 / H2S / CO), 3 gas (LEL / O2 / H2S), 3 gas (LEL / O2 / CO),
2 gas (LEL / O2), 2 gas (O2 / H2S), 2 gas (O2 / CO)
Two years material and workmanship
Download Product Datasheet (200KB PDF) click here

# Part Number Description
1 21-1880RK Front case, GX-2009
2 07-6017RK-01 Gasket for GX-2009 case, one each
3 30-1054RK Vibration motor for the GX-2009
4 51-1119RK LCD module assembly with flat cable for GX-2009
5 57-2052RK PCB main assembly, GX-2009
5 65-7001RK Dummy sensor for GX-2001 or GX-2009
6 21-1881RK Case, rear, GX-2009
7 10-1098RK-01 Screw with split lock and flat washers for alligator or belt clip, GX-2009, 1 each
8 10-1104RK Screw for case or sensor retainer, M2 x 10 mm, GX-2001 or GX-2009, pack of 100
9 33-1113RK-01 Metal mesh filter for buzzer hole, GX-2009, 1 each
9 49-0115RK 115 / 220 VAC Adapter for charger (charger base not included), GX-2009 
10 07-6018RK Gasket for buzzer hole, GX-2009
11 24-5000RK Flexible printed circuit (FPC), GX-2009
12 49-1050RK Battery, silver oxide, SR 616, 1.55 volts, GX-2009
13 49-1609RK NiMH battery set with hardware for GX-2009, set of 2 batteries
14 13-0116RK Alligator clip, GX-2009
17 21-1883RK Sensor case with PCB assembly, GX-2009
18 07-6008RK O-ring gasket for sensor case, GX-2009, pack of 10
18 07-6008RK-01 O-ring gasket for sensor case, GX-2009, 1 each
19 OS-BM2 Sensor, Oxygen (O2) for GX-2001/GX-2003/GX-2009/GasWatch 2/OX-01
20 NC-6264AS Sensor, LEL, for GX-2001/GX-2003/GX-2009/GP-01
21 ES-1821 Sensor, Carbon Monoxide (CO) for GX-2001/GX-2003/GX-2009/GasWatch 2/CO-01
22 ES-1827i Sensor, Hydrogen Sulfide (H2S) for GX-2009
23 07-6019RK Sensor chamber gasket,for sensor retainer,GX-2009, pack of 10
23 07-6019RK-01 Sensor chamber gasket,for sensor retainer,GX-2009, 1 each
24 21-1882RK Sensor retainer, GX-2009 (inner piece)
25 33-7114RK Filter disk, H2S scrubber, 5 pack, for combustible diffusion port, set of 5
26 33-7102RK Filter, charcoal, for CO sensor, pack of 5
26 33-7102RK-01 Filter, charcoal, for CO sensor, 1 each
27 07-6021RK Gasket, sensor retainer, pack of 10
27 07-6021RK-01 Gasket, sensor retainer, 1 each
28 33-0172RK Sensor Cover, water proof, sheet for 4 sensors, GX-2009, 1 each
29 21-1884RK Sensor cover, GX-2009 (outside piece)
30 10-1104RK-01 Screw for case or sensor retainer, M2 x 10 mm, GX-2001 or GX-2009, 1 each
31 13-0112RK Wrist strap, GX-2001/GX-2003
32 13-0117RK Belt clip, GX-2009

GX-2009 Video

This video will open in a new window. Also available on Youtube and CD (by request)
Specifications subject to change without notice. 

GX-2009 Callouts
5 unit charger for GX-2009
Optional multi-charger available.


Remote Sample Drawing Pump

Remote Sample Drawing Pump RP-2009
A compact battery operated sample-drawing pump that attaches in line for remote, portable monitoring. .
RP-2009 Portable Sample Draw Pump

Calibration Frequency

How often should I calibrate my GX-2009 gas monitor?

Calibration Frequency
What we generally recommend is that users develop a frequency of calibration that is tailored to their application and usage. Read more...



PC controlled Calibration Station

SM-2000 Calibration Station
A single module calibration station for the GX-2009 portable gas monitor that can calibrate, bump test, charge, and archive data.
SDM-2009 Calibration Station

Service Tips

Filter Replacement & Battery Refresh

Service Tip
H2S scrubber filters, used to protect the CO and LEL sensors, should be replaced every six months....
Filter Replacement & Battery Refresh